Microstructure Evolution During Remelting of High Solid Fraction ZL101 Alloy

This work deals with the reheating process for semi-solid thixoforming of ZL101(Al Si7 Mg) alloy. The semi-solid state can decrease the viscosity and the resistance while sheared because of the evolutional behavior,which is characterized by a solid-like behavior at rest and a liquid flow during shea...

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Bibliographic Details
Published in:Shanghai jiao tong da xue xue bao 2017-12, Vol.22 (6), p.712-718
Main Author: 罗帅 于沪平 邱海渊 申昱
Format: Article
Language:English
Subjects:
Aluminum base alloys
Architecture
Compression
Computer Science
Deformation
Electrical Engineering
Engineering
Eutectic temperature
Evolution
Fluid dynamics
Heating
Life Sciences
Liquid flow
Materials Science
Melting
Microstructure
Semisolids
Shear strength
Shearing
Shrinkage
Solid phases
Solid state
Temperature effects
Thixoforming
Viscosity
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Summary:This work deals with the reheating process for semi-solid thixoforming of ZL101(Al Si7 Mg) alloy. The semi-solid state can decrease the viscosity and the resistance while sheared because of the evolutional behavior,which is characterized by a solid-like behavior at rest and a liquid flow during shearing. The microstructure evolution of ZL101 alloy at different temperatures from 540 to 580?C has been studied. Results show that the eutectic temperature can affect the transformation speed of semi-solid structure. Semi-solid microstructures with high solid fraction can be obtained by controlling the reheating time in less than 20 min, while at the temperature lower than the eutectic temperature it needs more than one hour. Another character of semi-solid ZL101 alloy is the segregation of microstructures in semi-solid state, in which the liquid phase between the solid phases can flow freely and lead to the shrinkage of the sample during the heating process. As the holding time goes on, more shrinkage holes appear and change the surface of the specimen. These shrinkage holes are replenished by the liquid phase during compression deformation, resulting in the segregation of the components.
ISSN:1007-1172
1995-8188
DOI:10.1007/s12204-017-1885-6